5(6)-TAMRA (5-(and-6)-Carboxytetramethylrhodamine), mixed isomers (Invitrogen™)

5(6)-TAMRA contains a carboxylic acid that can be used to react with primary amines via carbodiimide activation of the carboxylic acid. This bright, orange-fluorescent dye produces conjugates with absorption/emission maxima of ∼555/580 nm.